Convert Foot-pound to tera-electronvolt

The electronvolt is the energy an electron gains crossing one volt, 1.602 × 10⁻¹⁹ J, and is the natural unit of the very small. Chemical bonds and visible light are a few eV, X-rays tens of keV, nuclear gamma rays MeV, and the Large Hadron Collider brings protons to 6.8 TeV each. Through E = mc² it also serves as a mass unit: an electron is 0.511 MeV, a proton 938 MeV, and the Higgs boson 125 GeV.

The foot-pound is the work of a one-pound force over one foot, 1.356 J. It is used in the US for the muzzle energy of firearms and airguns (a .22 rifle delivers about 100 ft·lb, a hunting rifle 2,000–3,000) and for the impact energy of tools and hammers. Do not confuse it with the pound-foot of torque: the same product of force and distance, but nothing moves, so it is not energy.